God Has Made The Killing Of Innocent People Unlawful

According to the Qur'an, one of the greatest sins is to kill a human being who has committed no fault:

...If someone kills another person - unless it is in retaliation for someone else or for causing corruption in the earth - it is as if he had murdered all mankind. And if anyone gives life to another person, it is as if he had given life to all mankind. Our Messengers came to them with Clear Signs but even after that many of them committed outrages in the earth. (Surat al-Ma'ida: 32)

Those who do not call on any other deity together with God and do not kill anyone God has made inviolate, except with the right to do so, and do not fornicate; anyone who does that will receive an evil punishment. (Surat al-Furqan: 68)
As we can see in the verses above, those who kill innocent human beings without a cause are threatened with evil punishment. God has revealed that killing one person is as great a sin as killing all mankind. Anyone who respected the prerogatives of God would not do harm to even one individual, let alone murdering thousands of innocent people. Those who think that they will escape justice and punishment in this world will never escape the account they must give in the Presence of God on the Last Day. So, those believers who know they will give an account to God after their death, will be very careful about respecting the limits God has established.www.muhammedhasenoglu.com visit here for further reading.
Salaam